Improvement in glass-presses



UNITED STATES PATENT OEEICE.

ARIES l?. BROOKE, OF NEW YORK, N. Y.

IMPROVEMENT IN GLASS-PRESSES.

To `all whom it may concern:

Be it known that I, ARIES P. BROOKE, of the city, county, and State of New York, have invented a new and Improved Glass-Press; and I Vdo hereby declare the following to be a full, clear, and exact description thereof', which Will enable those skilled in the art to make and use the same, reference being had to the accompanying drawing forming a part of this specification, in which drawing- Figure l represents a sectional front 'view of this invention. Fig. 2 is a transverse section of the same.

Similar letters indicate corresponding parts.

This invention relates to a glass-press intended particularly for making screw-insulators for telegraph-Wires or other articles of glass with internal screw-thread. The screw-plunger used inthis press is attached to a spindle so constructed that it allows of pressing the screw-plunger into the molten glass, and then turning the same out of the screw-thread after the glass has set, during which latter motion the spindle must be capable of being turned and of moving endwise as it is pushed out by the screw-threads of the plunger. The head of the screw-plunger is made detached from the body thereof, so that it can be raised clean out of the mold before the plunger is screwed out, and thereby the articles produced by this press are prevented from cracking at the top. l

In the drawing, A designates a yoke which is securedto a base or bed-plate, B, and to the sides of which are attached guides C, on which moves a frame, D. This frame is rmly secured to a rod, E, which extends up through a suitable guidehole in the yoke A, and is connected to a handlever, F, which serves to depress the rod E and frame D. The hand-lever F has its fulcrum on a pivot, a, secured in the top end of a link, G, which is pivoted to the bottom part of the yoke A, and a balance-Weight H serves to carry the rod E and frame D back to their original position Whenever the hand-lever is released. From the frame D is suspended a bar, I, which also slides up and down on the guides O, and which is connected to the frame by rods b Round these rods are Wound springs c, the bottom ends of which bear against pins d passed transversely through the rods c, so that the bar I is rendered yielding in regard to the frame D. To said bar is secured the follower J, which serves to prevent the top edge ofthe insulator or other article to be pressed from getting rugged or uneven. rllhe slide-rod E is bored out to receive the upper smooth end of a spindle, K, to the bottom end of Which is secured the screw-plunger L. On said spindle is mounted a bevel-pinion, M, connected to the spindle by a feather-key, so that by turning the pinion the spindle is compelled to rotate Without being prevented from moving endWse, the pinion being held in position by lips catching in an annular groove in its hoop or by any other suitable means. Motion is imparted to said pinion by a bevel-Wheel, N, mounted on a shaft, c, Which has its bearing in a bridge attached to the frame D, and which can be revolved by means of a hand-crank, f. If the mold O is iilled with molten glass, and the rod E, together with the frame D, is depressed, the screw-plunger enters into the molten glass, and as soon as the glass has set a revolving motion is imparted to the spindle K, and thereby the screwplunger is made to turn out of the screw-thread formed in the glass. It is obvious that the mechanism for depressing and for turning the spindle K. can be modied in various Ways, and I do not Wish to confine myself to the precise devices shown. If the upward motion of the rod and plunger, While the latter is being turned out of the screw-thread in the glass, should be made dependent solely upon the thread in the glass, the thread Would be liable to be injured, and l have therefore provided the spindle E with a screw-thread, g, equal in pitch to the thread on the plunger. The screw-thread g is tted into a nut,

h, secured to the top bar of the `frame D, and by turning' the spindle K in the proper direction the plunger can be so adjusted that it projects the proper distance through the follower J 5 and after the plunger has been depressed into the molten glass, and the glass has set suiciently, the spindle is turned back and the plunger is raised out of the'mold by the action of the screw-thread g, thus avoiding all danger of injuring the screwthread in the glass. The headz' of the screw* plunger L is made detached from the plunger itself, and it is connected to a lever, j, (best seen in Fig. 2,) so that the same can be raised out of the glass before a revolving motion is imparted to the spindle and to the plunger. If the headt' revolve with the plunger the top of the insulator or other article to be pressed is liable to crack,

but by making the head detached all danger of injuring the top of the article to be produced by the revolving' motion imparted to the plunger in unscrewing the same from the glass is avoided. The lever j has its fulcrum on the pivot 7c secured in lugs attached to the bottom bar of the frame D, and it is held up in the position shown in Fig. 2 by a hook or other catch, I., which is pivoted to the top bar of the frame D. By releasing the lever and depressing its outer end the head of the plunger L is made to slide upon the spindle K. The sliding head is prevented from falling too lo7 on the plunger by mea-ns of the top m ofthe plunger, Which form s a stop, with which the iian ge n of the sliding headz' comes in contact. The

stop for adjustingthe lowest position of the head i can, if desired, be combined with the lever j instead.

Vitnesses NV. HAUFF, E. F. KAs'rENHUBER. 

